Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2004-11-29
2008-12-23
Urban, Edward (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S234100, C455S239100, C455S136000, C455S138000, C455S245100, C375S345000, C330S254000, C330S279000
Reexamination Certificate
active
07469134
ABSTRACT:
In order to avoid disappearance of output symbols in accompaniment with DC voltage fluctuations occurring at the timing of switching gain in receiving systems for mobile telephones or the like compatible with W-CDMA systems, the present invention provides a variable gain amplifier circuit, a gain control circuit and a mobile communication terminal apparatus, in which a PGA section is comprised of PGAs having different amplification widths continuously arranged in plural stages as in, two coarse adjustment PGAs, a fine adjustment PGA and a coarse adjustment PGA from the input side to the output side; and a gain control circuit has a memory storing a history of gain control with regard to the PGA section and a logic circuit individually controlling gain of each PGA.
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Tamura Masahisa
Yoshizawa Atsushi
Chen Junpeng
Frommer William S.
Frommer & Lawrence & Haug LLP
Presson Thomas F.
Sony Ericsson Mobile Communications Japan Inc.
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